Improved bolt-threader



e'IDnoN W. MINeUs,

or roMnn'o Y, onto.

Leners Patent N0.1o3,642, dateaMa/y 31, 1870.

*daf- IMPROVE!) BOLT-THREADER.

The Schedule vreferred to in these Letters Patent and making part of the same.

To all whom it 'may concern Be it known that I, GIDEoN W. MINGUS, of Pomeroy, in the county of Meigs and State of 0hio,have invented a new land useful Improvement in Boltlhreader; and do hereby declare that the following is a. full, clear, and exact description thereof', which will Y enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification. This invention relates to au improved screwethread cutter for threading bolts, and consists in a'pair of die-carrying jaws hinged to a hollow mandrel near its end, and arranged for their free ends which project beyond the end of the mandrel to work in a slotted transverse bar, or`it may be a disk having a set-screw at one end of the slot, and an eccentric bar at the other, working against the outer faces of the diecar. ryingjaws to hold them up to the work. The setserew makes the adjustment'for the size of the bolt, and the eccentric releases the jaws to discharge the nished bolt. A solid die or wrench may be applied in place of the screw-cutting dies, to turn a tap for tapping n uts.'

Figure 1 is a side elevation of my improved boltt-hreade, a part being broken out;

Figure 2 is an end view; and

Figure 3 is a plan of a solid die or wrench to be attached in place of the screw-cutting dies for operating taps. y

Similar letters of reference indicate corresponding parts.

A is the hollow mandrel. 4It may be arranged to work in bearings in any suitable support, and have gear-wheels, or other means applied for turning it.

B represents the die-carrying jaws, pivoted between ears Dat C to'the mandrel, near one end, and so that the swinging ends project beyond the end thereof.

E is a slotted bar placed on the jaws near the ends transversely, and held in the required position by the pins F.

One end has aset-screw, G, tapped through 1t to bear against the rear side of one of the jaws, and the other end has an eccentric lever, H, pivoted 1n the slot, to bear against the outer side of the other jaw.

I represents the dies attached to the insides ot' the' jaws, and within the slot of the. bar E, so that the walls thereof .keep them in position laterally, when turning around'the rod or bolt.

The ears D being rmly attached to the mandrel, of' necessity turn with-it, and thus the bar E and the dies also receive rotary motion.

The s'et-screw G is first adj usted so that, when the eccentric is tnrnedto the position represented in the drawing, the jaws will be right for the rod or bolt to be threaded, which is then applied and threaded iu the ordinary way tothe extent required. The eccentric lever H is then turned back to release the holt,l

and the apparatus is ready for the next operation.

For tapping nuts, I propose to remove the dies I, andapply the solid Id ie or wrench K, which is provided with studs L for taking into notches or sockets in the faces of the jaws, to receive and hold them, the jaws being clampedagainst them by the eccentrics. The square end of the tap may be placed in this wrench and turned thereby. a

Having thus described my invention, y

I claim as new and desire to secure by Letters Iatent- Ihe combination of the mandrel A, ears D, diecarrying jaws B, slotted bar E, set-screw G, and eccentric lever H, all constructed and arranged substantially as specified. t

GIDEON W. MIN GUS.

Witnesses:

B. B. DIoKERsoN, E. J. WILLIAMS. 

